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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am trying to rescue an old Mac for my nephew. It is the PowerPC G3, 450 MHz, front loading DVD edition. We loaded Dapper Drake.

The install went very smoothly. The only issue is that the screen keeps shaking - more like vibrating - so that the machine is unusable for long periods of time. This issue did not manifest itself when the iMac ran OS9.

I have reviewed other forums and have checked the xorg.conf for the refresh settings and they appear to be correct. So, are there other settings that could prevent the screen from vibrating or is this possibly a hardware issue?

That would be an excellent test. I wish we could go back to the old system, but OS9 has already been wiped from the machine. There was an urgent need to upgrade as the limitations of OS9 (weak word processor, lack of modern browser) required the upgrade. My nephew went with the entire install instead of the dual boot option.

We do know that this was not a problem in OS9 - so could it be an xorg.conf setting that I am not seeing? Or is it more likely a hardware issue?

that is what i am trying to tell you - to find out if it is a hardware issue, put your os9 install disk into the drive, boot and just leave the computer in the graphical install (assuming here os9 install is graphical - like osx) if the screen appears to be wobbly there too you know it is a hardware issue!!
same with a linux live cd - boot, and leave the computer in X11 mode and wait for the 'wobble' effect to appear - if it does you have a hardware issue - if it does not - well - then i dont know what it is